/*
 * JSF Toolkit Component Framework
 * Copyright (C) 2007 Noah Sloan <iamnoah A-T gmail D0T com>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 */
package com.jsftoolkit.gen.config.impl;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.jsftoolkit.gen.config.TaglibEditor;

import static com.jsftoolkit.gen.config.DomUtils.*;

public class TaglibEditorImpl extends XmlEditor implements TaglibEditor {

	private XPathExpression existingTag;

	private XPathExpression componentElement;

	public TaglibEditorImpl() throws ParserConfigurationException,
			XPathExpressionException {
		super();
		existingTag = xpathFactory.newXPath().compile(
				"/facelet-taglib/tag[child::tag-name[normalize-space()=$tag]]");

		componentElement = xpathFactory.newXPath().compile("component[1]");
	}

	public Element registerTag(Document doc, String tagName,
			String componentType, String rendererType)
			throws XPathExpressionException {
		vars.get().clear();
		vars.get().put("tag", tagName);

		Element root = doc.getDocumentElement();
		// set the tag name
		Element tag = findOrCreateElement(doc, root, existingTag, "tag", null);
		setElementValue(doc, tag, "tag-name", tagName);

		// get the component element
		Element component = findOrCreateElement(doc, tag, componentElement,
				"component", null);

		// set the types
		setElementValue(doc, component, "component-type", componentType);
		setElementValue(doc, component, "renderer-type", rendererType);

		return component;
	}

}
